diff options
Diffstat (limited to 'tools/testing/radix-tree')
| -rw-r--r-- | tools/testing/radix-tree/maple.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/tools/testing/radix-tree/maple.c b/tools/testing/radix-tree/maple.c index ef5b83cf94ea..ad42a36231fb 100644 --- a/tools/testing/radix-tree/maple.c +++ b/tools/testing/radix-tree/maple.c @@ -36283,6 +36283,38 @@ static void check_nomem_writer_race(struct maple_tree *mt) mtree_unlock(mt); } + /* test to simulate expanding a vma from [0x7fffffffe000, 0x7ffffffff000) + * to [0x7ffde4ca1000, 0x7ffffffff000) and then shrinking the vma to + * [0x7ffde4ca1000, 0x7ffde4ca2000) + */ +static inline int check_vma_modification(struct maple_tree *mt) +{ + MA_STATE(mas, mt, 0, 0); + + mtree_lock(mt); + /* vma with old start and old end */ + __mas_set_range(&mas, 0x7fffffffe000, 0x7ffffffff000 - 1); + mas_preallocate(&mas, xa_mk_value(1), GFP_KERNEL); + mas_store_prealloc(&mas, xa_mk_value(1)); + + /* next write occurs partly in previous range [0, 0x7fffffffe000)*/ + mas_prev_range(&mas, 0); + /* expand vma to {0x7ffde4ca1000, 0x7ffffffff000) */ + __mas_set_range(&mas, 0x7ffde4ca1000, 0x7ffffffff000 - 1); + mas_preallocate(&mas, xa_mk_value(1), GFP_KERNEL); + mas_store_prealloc(&mas, xa_mk_value(1)); + + /* shrink vma to [0x7ffde4ca1000, 7ffde4ca2000) */ + __mas_set_range(&mas, 0x7ffde4ca2000, 0x7ffffffff000 - 1); + mas_preallocate(&mas, NULL, GFP_KERNEL); + mas_store_prealloc(&mas, NULL); + mt_dump(mt, mt_dump_hex); + + mas_destroy(&mas); + mtree_unlock(mt); + return 0; +} + void farmer_tests(void) { struct maple_node *node; @@ -36290,6 +36322,10 @@ void farmer_tests(void) mt_dump(&tree, mt_dump_dec); + mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE | MT_FLAGS_LOCK_EXTERN | MT_FLAGS_USE_RCU); + check_vma_modification(&tree); + mtree_destroy(&tree); + tree.ma_root = xa_mk_value(0); mt_dump(&tree, mt_dump_dec); |